Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a3f32b901c5e54…

MALICIOUS

PDF

90.6 KB Created: 2021-09-19 01:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c4507b8d6d39f47ee13d372ef28d4b3 SHA-1: fa117a91a68967703d655d65a9fbdbe1fa8a7c2b SHA-256: 15a3f32b901c5e54228367ff5cb109c9dc206ed85571b0e04dca53d3e090393f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/31447776061.pdf In PDF document text
    • http://ourgans.org/userfiles/files/32918814546.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/delexijojowuzonegomuxama.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/laniweko.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/49626386795.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/tifagupugudodawo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb328477c3---mokisejimevakitularo.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/lafutazojuxijiwekodura.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/10241376223.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/mobivaxip.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141eea7e44a4---reberozexelupepuwikuvivug.pdfIn PDF document text
    • http://grupophi.es/uploads/files/48214968851.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/70575639562.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/56988107878.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/loxuvumigexokafapuvuba.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/seteralo.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3da240dd1---12407384599.pdfIn PDF document text
    • http://dgkno.cn/upload/51115452853.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/zajijukigawodiluwodavoma.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144d2016ad53---87073093302.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466b9ca426a---semozewapanerifosonodof.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/75123457453.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/p1sl3srkpe5bb5dk2smptki4ub/babexegaw.pdfIn PDF document text
    • http://soles2walk.com/data/file/46089062402.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/fudexogodawumatokew.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/69173587437.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/32638907976.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145643864972---wifasepepogigufexigexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=artemis+fowl+book+5+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 10828 bytes
SHA-256: b3b070f781438b0e4067ed072f2ee594bb372223b4f02c569bea5e2ea563fa62
font_01_sfnt_off000114c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C8 18428 bytes
SHA-256: 7b5123ca321f3f940d50e454baf0ed59cc6927609f675a3fc6c7f582c8122644
font_02_sfnt_off00014492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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